发明名称 Method of and apparatus for noise reduction in multigradation image signal.
摘要 A multi-gradation image signal obtained by multi-gradationisation of a signal obtained by reading through a CCD (1) on original having a half tone is supplied to an unsharp signal producing part (5), which in turn outputs an unsharp signal (SU) produced from the multi-gradation image signal and the multi-gradation image signal (SS) itself. A comparator (12) discriminates a shadow portion of the original by comparing the multi-gradation image signal (SS) with a reference value. As a result, a signal which is unsharp in the shadow portion of the original is produced from the multi-gradation image signal (SS) and the unsharp signal (SU).
申请公布号 EP0271912(A2) 申请公布日期 1988.06.22
申请号 EP19870118768 申请日期 1987.12.17
申请人 DAINIPPON SCREEN MFG. CO., LTD. 发明人 MURAKAMI, SHIGEO DAINIPPON SCREEN MFG. CO LTD. 1-1
分类号 H04N1/19;H04N1/409 主分类号 H04N1/19
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